One problem related to engine noise has been reported for the 2004 Toyota 4Runner. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Toyota 4Runner based on all problems reported for the 2004 4Runner.
I just perchased a 2004 Toyota 4 runner sport edition v8 in February. I have just completed the "break-in" period and have begun to increase my speed on the highway. A cyclical vibration and noise is noticed from the engine at 70 miles per hour that increases in frequency as vehicle speed is increased. The noise subsides once you let off the gas regardless of speed. In addition, steering wheel and brake pedal vibrates between 1500 and 2000 rpm range at various speeds.